Thanks for your reply!
I'd like to ask how to enter test mode and load all items in my bank and rebirths from the old save file to the newly created save file?
By the way, is this "UnstableDEV" version is the test mode?
you don't load anything from your bank you write down what you have and spawn them and put it in new bank and rebirth to the amount of rebirths you had before switching test mode off before the last rebirth